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TM-5-4210-220-12 Truck Firefighting: Powered Pumper: Foam and Water 500-GPM Capacity; Centrifugal Pump Power Takeoff Driven Manual
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Figure 1-34.  Air Supply and Storage System
TM 5-4210-220-12 1-18.  AIR SYSTEM.  In this paragraph, only that part of the air system comprising air supply and storage, and driving accessory  operation  is  covered.    Details  of  the  remaining  parts  of  the  system  are  provided  in  paragraph  1-13,  engine governor and throttle control, paragraph 1-14, engine cooling system, paragraph 1-15, drive train, and paragraph 1-19, firefighting system. a.  Air Supply and Storage System. (1)  The air flow through the system is shown in figure 1-34 Filtered air is drawn from the engine turbocharger into the compressor.  Here the air is compressed and discharged via the dryer into the primary reservoir. (2)    The  air  flow  from  the  primary  to  the  secondary,  emergency,  and  fast  reservoirs  is  restricted  by  pressure protection valves (A).  These valves isolate the primary reservoir until sufficient pressure is available to permit vehicle operation.  When this pressure is obtained, pressurization of the remaining reservoirs takes place The check valves (K) prevent backflow from the emergency and fast reservoirs once these are charged. (3)  The fast reservoir is open to the primary reservoir whenever the ignition switch is set to ON.  The reservoirs are connected via the air starter valve.  This valve is operated by pilot air pressure from the fast reservoir via a solenoid valve. (4)      To   provide   quick   pressurization   of   the   primary   tank   immediately   after   start   up,   the   fast   reservoir   is maintained fully charged and isolated when the ignition is OFF. (5)  During normal operation, the system is charged until maximum pressure is reached in all reservoirs.  When this  occurs,  the  system  pressure  is  sensed  by  the  compressor  via  the  (RS)  line  from  the  secondary  reservoir  and  the compressor  starts  to  unload.    Unloading  continues  until  the  system  pressure  is  well  below  maximum.    When  this happens, the unloading stops and charging continues. (6)    While  the  system  is  charging,  the  air  flowing  through  the  air  drier  is  dehumidified.    The  moisture  is precipitated and collected in the bottom of the drier.  When the compressor unloads, the discharge air opens a valve in the bottom of the drier and the accumulated moisture is blown out by a backflow of pressurized air.  This air, still hot from compression, also removes residual moisture from the drying element. (7)  Pressure gages for the primary, secondary, and emergency reservoirs are provided in the cab. 1-40

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